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The Origin of Moire-Level Stick-Slip Behavior on Graphene/h-BN Heterostructures

机译：The Origin of Moire-Level Stick-Slip Behavior on Graphene/h-BN Heterostructures

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摘要

Frictional behavior of a nanoscale tip sliding on superlattice of alignedgraphene/(hexagonal boron nitride) h-BN heterostructure is found to bestrongly regulated by the moiré superlattices, resulting in long-range stick-slipmodulation in experimental measurements. Through molecular dynamicssimulations, it is shown that the origin of moiré-level stick-slip comes fromthe strong coupling between in-plane deformation and out-of-plane distortionof the moiré superlattice. The periodicity of long-range modulation decreasesas the interfacial twist angle increases, once the periodicity of moiré becomessmaller than the contact region between the tip and graphene, the long-rangemodulation becomes smooth and the stick-slip behavior disappears. It isfound that the contact trajectory of the tip during sliding is the key to revealthe underlying mechanism, based on which a modified Prandtl-Tomlinsonmodel is proposed considering deformation coupled effect to reproduce thefrictional properties observed in molecular dynamics simulation. These findingsemphasize the critical role of the moiré superlattice on frictional propertiesof van der Waals (vdW) heterostructures and open an avenue for therational design of vdW devices with controllable tribological properties.

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